Device for testing the efficiency of a spark-plug.



l7 A v M 5 1/9 3 c m w J. W. PRASKY.

DEVICE FOR TESTING THE EFFICIENCY OF A SPARK PLUG. APPLICATlON FILED lULY15.1914.

Patented July 25,1916.

JAMES W. PRASKY, OF PITTSBURGH, PENNSYLVANIA. I

DEVICE FOR TESTING THE EFFICIENCY OF A SPARK-PLUG.

Specification of Letters Patent.

Patented July 25, 1916.

- Application filed July 15, 1914. Serial No. 851,102.

To all whom it may concern:

Be it known that I, Jnms 1V. PRASKY, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Devices for Testing the Fflieiency of a Spark-Plug, of which the following is a specification. This invention relates to a device for testing the efficiency of a spark plug and has for its object to provide means to determine whether or not a spark plug is in condition to properly spark.

\l'ith the above and other objects in view 1 have invented the device illustrated in the accompanying drawings in which- Figure 1, is a side elevational view of my improved spark and plug tester. Fig.2, is a view of the other side thereof, shown partly broken away. Fig. 3, is a section taken on line Ar\ of Fig. 1. Fig. 4, is an elevational view of the inner side of one member of the device. Fig. 5, is a similar view of another member.

Like reference characters indicate like parts throughout the several views in the drawings in which 1, indicates the spark plug tester which consists of a'pair of shelves 2 and 3, each having opposing grooves 5, G, and 7. which are adapted to' receive the wires 8, 9, 10 and 11. Thewires S and 9, have right angular opposing ends 12 and 13, which terminate in the central portion of the opening 11, and extending through the flat body portion 15, of the member 1. The ends 16 and 17, of the members 10 and 11, terminate in the central portion of said opening 11 adjacent the ends 12 and 13 in order to intensify the spark, all of said ends being slightly separated in order to form a spark gap. Seated over one end of said opening 14, in the recess 18, is a removable disk 19, formed preferably of dark material against which a spark may be more readily seen. Seated in the recess 20, and over the other end of the opening 14, is a glass 21. whereby a spark may be readily seen and at the same time the wires in .the opening 14, will be protected. The opening 11- permits access to the terminals 12 and 13 so they may be kept clean.

The member 1, is provided with a long arm 22, from the end of which projects the upper end of the wire 8, and a short arm 23, from which projects the upper end of the wire 9. The shelves 2. and 3, are formed preferably of wood, because of its inexpensive ness. After the wires 8, 9, 10 and 11, are seated in the grooves therefor in the member 2, the member 3, is glued or otherwise secured in place upon the member 2.

In operation, the wire 9, is placed upon a spark plug" (not shown) and the wire 8, against any portion of the engine (not shown) whereby, it the spark plug is in working condition, the sparks will be caused to jump the gaps between the terminals 12 and 13 or 12, 13, 16 and 17, of the wires 8 and 9 or 8, 9, 10, and 11, in the opening 14. However, if the spark plug is out of order a spark will not be produced in the opening 14, and it will therefore be seen that the trouble exists in the spark plug.

Having now described my invention, that which Iclaim to be new and desire to procure by Letters Patent is 1. A portable spark plug tester consisting of a pair of similarly formed shells secured together and having bores therein, wires in said bores, the inner ends 'of which are spaced apart to form a spark gap, the body portion of said tester being substantially flat and having an opening therethrough into which said ends project, and a glass disk forming a closure for one end of said opening, a dark disk for the other end of said opening, forming a closure, and a back ground for said ends.

2. A portable spark plug tester consisting of a pair of similarly formed shells secured together and having bores therein, wires in said bores, the inner ends of which are spaced apart to form a spark gap, the body portion of said tester being substantially flat and having an opening therethrough into which said ends project, and a glass disk forming a closure for oneend of said opening.

3. A portable spark plug tester consisting of a pair of similarly formed shells secured together and having bores therein, wires in said bores, the inner ends of which are spaced apart to form a spark gap, the body portion of said tester being substantially flat and having. an opening therethrough into which said ends project, a glass disk forming a closure for one end of said opening, and a back ground for said ends.

4. A portable spark plug tester consisting of a pair of similarly formed shells secured together and having bores therein, wires in said bores, the inner; ends of which are spaced apart to form a spark gap, the body portion of said tester being substantially fiat and having an opening therethrough into which said ends project, a glass disk forming a closure for one end of said opening, a back ground for said ends, and said tester having a long and a short arm projecting from said body portion, the outer ends of said wires projecting beyond said arms.

5. In a testing device an insulating body comprising a pair of members at least one of which has an opening therethrough, a pair of conducting members the ends of which are bent at right angles and terminate in said opening said conducting mem- 15 bers being arranged between said first mentioned pair of members.

6. A testing device comprising a body having an opening therein and a plurality of wires embedded in said body and having 20 right angular ends terminating in said opening.

In testimony whereof I afiix my signature in presence of two witnesses.

JAMES W. PRASKY. Witnesses J. G. ROYAL, W H. ROBERTSON.

Copiesof this patent may be obtained for five cents each, by addressin'g the Commissioner of Patents,

' Washington, D. O. 

